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trouble with response to edma3 interrupt on dm6437

I was using EDMA3 LLD programing EDMA on DM6437.

NOW, i set up the HWI interrupt in DSP/BIOS as it required using HWI5, the interrupt selection number is 36, the function is _lisrEdma3ComplHandler0.

And the GIE bit and IER bit are also set.

The TCINTEN in the EDMA channel PRAM also set to 1.

When my programing runs, I can receive the data from McBSP to DSP,and EDMA moves them to my DSP memory, but i can't call my EDMA interrupt ISR,

when I checked my registers,i found that the correspongding bit in my IER and IPR are 1, but it didn't get into my ISR,even the lisrEdma3ComplHandler0.

Can anyone help me? THX!!